Incorrect. The phone did not emit any siren.

I had no idea it had dialed anything until I happened to hear the operator. It wasn't even on speakerpbone but normal phone mode, so it was quiet, but luckily I was in a quiet room at thd time.

The speaker was functional. Other normal sounds were happening. It did vibrate, but it does that for several ordinary events, including reboot which I was half expecting, and so was not alarming.

Perhaps the audibility is configurable, placing this right back into "tool under the users control", and covert if the user wants it to be.